}
			filterChain.Filters = append(filterChain.Filters, filter)
			log.Debugf("attached HTTP filter with %d http_filter options to listener %q filter chain %d",
				len(httpConnectionManagers[i].HttpFilters), ml.Listener.Name, i)
		}
	}

	return nil
}

func (configgen *ConfigGeneratorImpl) buildGatewayListeners(builder *ListenerBuilder) *ListenerBuilder {
	if builder.node.MergedGateway == nil {

	if err != nil || hcm == nil {
		return []string{}, err
	}

	// Identify RBAC policies. Currently there are no "breadcrumbs" so we only return the policy names.
	for _, httpFilter := range hcm.HttpFilters {
		if httpFilter.Name == wellknown.HTTPRoleBasedAccessControl {
			rbac := &rbachttp.RBAC{}
			if err := httpFilter.GetTypedConfig().UnmarshalTo(rbac); err == nil {
				policies := []string{}